塔菲尔方程
电解
析氧
电极
电化学
化学
分析化学(期刊)
化学工程
质子交换膜燃料电池
电化学能量转换
材料科学
电流(流体)
电解水
聚合物电解质膜电解
电荷转移系数
催化作用
电解质
循环伏安法
热力学
色谱法
物理化学
有机化学
物理
工程类
作者
Matthias Kroschel,Arman Bonakdarpour,Jason Tai Hong Kwan,Peter Strasser,David P. Wilkinson
标识
DOI:10.1016/j.electacta.2019.05.011
摘要
For the first time, the oxygen evolution reaction (OER) behavior of commercial catalyst-coated membranes (CCMs) has been studied using an in-house modified rotating disk electrode (MRDE) tip capable of reaching current densities of up to 2 A cm−2. The electrochemical results are comparable with a full PEM electrolysis cell. The kinetic analysis reveals Tafel slopes of about 50 and 60 mV dec−1 for all temperatures with the PEM electrolysis hardware and the MRDE, respectively. The activation energy of the OER obtained with the MRDE and the PEM electrolysis cell are 75 and 68 kJ mol−1, respectively. Detailed cyclic voltammetric measurements of Ir-based CCMs were performed to examine the influence of operating temperature, Ti-based current collectors, the scan rate on the adsorbed charge, and the electro kinetics of the OER. Six different expanded metal Ti current collectors were analyzed in sulfuric acid and their impact on the CCM charging at various temperatures were examined in order to calculate the electrode's inner and outer charge. It was observed that the voltammetric charge is proportional to the coverage of the CCM by the current collector. The MRDE tool presented here is an ideal tool for electrochemical characterization of CCMs and current collectors and allows for an economical and accelerated screening of these important PEM electrolyzer components without the requirement of full cell testing.
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